Books like The Greek Who Stole Christmas

This a thrilling story about to two brothers (one actually because the older brother is an absolute idiot) Nick and Tim. Tim is the older brother and his profession is a Private Detective, But unfortunately he barely knows anything about detective work and instead his little brother Nick does all the work for him. As explained in the book Nick records all their cases and this is one of them. This specific case is very brief but interesting. One day a man came in to Tim's office, he offered him a job to protect the world's most famous pop star Minerva. She was getting threatening letter about her getting killed. As the brothers, well Nick was working the case it was was time for Minerva to turn on the christmas lights on Regent street but because of Tim's stupidness they do eventually get fired.