Fermat turned around in shock. "Who…" the words died on his lips as he looked up into the face of the girl he never thought he would see again. She was about 17 and about 5ft3 her long brown hair lay in a plait across one shoulder and her bright aqua eyes sparkled as she looked at him.

"Hey bro" she smiled winking at him and tossing her plait across her shoulder "long time no see"

Fermat looked at her shocked. "W-w-w-where have y-you been? Dad was w-w-w-worried s-sick about you! W-w-why didn't you ph-ph-call? W-why why didn't you…"

The girl winced "Fermat I'm sorry, I didn't mean to be away so long, honest"

Fermat just stood there glaring Daggers at her. She raised her hands in surrender "I swear I meant to, but when I tried to find you guys I couldn't, it was like you had disappeared off the face of the earth or something"

Fermat stared blankly at her "you tried to f-f-f-find us? W-we thought you just dis-dis-vanished off the face of the earth"

Both of them stood facing each other in silence not knowing what to say until Fermat piped up "I-I was going to get a d-dri-drink in the café over there, d-do you want to c-come?". The girl smiled down at him, "sounds good bro, it's my shout then".

The brothers walked in 15 minutes later after going on the ride, Scott was the first to see the two of them sitting at the table and he stopped at the sight "hey look guys Fermat's got a girl!"

Alan's jaw dropped "wow" he paused "good work Fermat" he laughed "I didn't know he had it in him."

"Its not fair!" wailed Gordon looking at the girl Fermat's only 14 why should he get the hot chicks and leave me with none. Geeky guys get all the fun".

Virgil, Scott and Alan all exchanged looks at Gordon's behaviour "someone's jealous" Virgil laughed "just because he can't pull a girl and Fermat has the skills he whinges"

"Hey Fermat" Alan called striding over to the table, "who's the girl"

Fermat jumped into the air "oh A-Alan" he relaxed while his sister tensed up "th-th-this is my s-s".

"Sister" chirped the girl helpfully as the others walked up "I'm Fermat's sister, my names Cassie nice to meet you all"

Four jaws dropped at once "What?" Scott finally blurted out "neither you nor your dad ever said anything about a sister?"

Cassie turned to Fermat and gave him a look that said quite plainly what she was thinking, Fermat winced. "Its-it's n-not that I d-didn't want to talk about y-y-you Cass, it's-it's just" he trailed off.

"It's just what Fermat, speak up" snapped Cassie

Fermat sighed "D-dad th-th-th-decided it would be b-best if the Tracy's didn't know about y-y-you. He, he said if you c-c-came b-back he w-w-would t-t-tell them then b-b-but when you didn't he, he just th-th-thought it w-w-would be better if we, we just, l-l-left it as it w-w-was"

Cassie sighed deeply, "I guess it is my fault then. I know I shouldn't have run off, know I have found you guys again though do you think dad would let me come back?"

Scott coughed "I am afraid it's not really your father's decision anymore. Your father lives on our family island in the pacific and so it's my father's decision whether you can come live with us"

Cassie's face fell with his words

"I don't see why he would object to it though" Gordon said reassuringly "He and Brains are pretty close and he would want him to be happy". He smiled at her and extended his hand for her to shake "I'm Gordon Tracy" he said with a wink "it's a pleasure to make your acquaintance"